package com.quzhi.sys.controller;

import com.quzhi.common.Result;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.UUID;

@Slf4j
@RestController
@RequestMapping("/sys/common")
public class commonController {

    @Value("${QuZhi.imagePath}")
    private String basePath;


    /**
     * 图片上传
     *
     * @param file
     * @return
     */
    @PostMapping("/upload")
    public Result<?> upload(MultipartFile file) {
        //file是一个临时文件，需要转存到指定位置，否则本次请求完成后临时文件会删除


        // 原始文件名
        String originalFilename = file.getOriginalFilename();
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
        // 随机生成文件名称,防止文件名称重复造成文件覆盖
        String fileName = UUID.randomUUID().toString() + suffix;

        // 创建一个目录存放头像
        File dir = new File(basePath);


        // 判断当前目录是否存在
        if (!dir.exists()) {
            // 不存在则创建
            dir.mkdir();
        }

        try {
            // 将临时文件转存到指定位置
            file.transferTo(new File(basePath + fileName));
        } catch (IOException e) {
            throw new RuntimeException(e);
        }

        return Result.success(fileName, "上传成功");
    }

    /**
     * 文件下载
     *
     * @param name
     * @param response
     */
    @GetMapping("/download")
    public void download(@RequestParam String name, HttpServletResponse response) {
        try {
            // 输入流，读取文件内容
            FileInputStream fip = new FileInputStream(new File(basePath + name));
            ServletOutputStream outputStream = response.getOutputStream();
            System.out.println(basePath+name);
            response.setContentType("image/jpeg");

            // 输出流,通过输出流将文件写回浏览器，在浏览器展示图片
            int len = 0;
            byte[] bytes = new byte[1024];
            while ((len = fip.read(bytes)) != -1) {
                outputStream.write(bytes, 0, len);
                outputStream.flush();
            }

            // 关闭资源
            outputStream.close();
            fip.close();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * 删除取消上传的文件
     */
    @GetMapping("/deleteFile")
    public Result<?> deleteFile(@RequestParam String FileName) {
        if (FileName.equals("") || FileName == null){
            return Result.success("取消修改");
        }else{
            File file = new File(basePath + FileName);
            file.delete();
            return Result.success("删除成功");
        }
    }
}
